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HL: Fachverband Halbleiterphysik

HL 13: Poster Session I

HL 13.33: Poster

Montag, 12. März 2018, 17:30–19:30, Poster B

Suppression of interference effects in electroreflectance spectroscopy on Cu(In,Ga)(S,Se)₂ solar cell buffer layers — •J. Seeger¹, U. Piesch¹, O. Kiowski³, D. Hariskos³, W. Witte³, M. Powalla^2,3, P. Eraerds⁴, R. Lechner⁴, T. Dalibor⁴, H. Kalt¹, and M. Hetterich² — ¹Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — ²Light Technology Institute, KIT, 76131 Karlsruhe, Germany — ³Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), 70563 Stuttgart, Germany — ⁴AVANCIS GmbH, 81739 München, Germany

Cu(In,Ga)(S,Se)₂ thin-film solar cells are a great alternative to the widely spread silicon technology. One approach to further improve them is to find alternative materials for the commonly used CdS buffer layer. CIGS solar cells with different buffer materials are investigated utilizing electroreflectance spectroscopy (ER). While ER can readily be applied to absorber layers [1], the investigation of buffer layers is often quite challenging. One reason for this is the low thickness of the buffer layer, which leads to a weak signal. Therefore, occurring interference effects in the layer stack can have a strong influence on the ER spectra. Measuring scattered instead of specularly reflected light can reduce such interference effects [2]. Another approach is the reduction of the ZnO window layer thickness by etching it partially away. Results for both techniques will be discussed in this contribution.

[1] C. Huber et al., Phys. Rev. B 92, 075201, 2015.

[2] C. Krämmer et al., Appl. Phys. Lett. 107, 222104, 2015.